Electromagnetic relay contact isolation structure

Abstract

The utility model discloses an electromagnetic relay contact point isolation structure, it relates to relay technical field, including relay main part, base, cover and isolation frame, the base is evenly provided with a plurality of contact pieces, and the bottom of base is provided with the contact tail piece with the electric connection of contact piece in the position corresponding contact piece, the back of base is fixedly provided with the backplate, the isolation frame is detachably arranged on the base and backplate, and is provided with at least two arc separation plates on the isolation frame and divides a plurality of contact pieces into at least two contact groups horizontally, the utility model discloses setting up arc separation plate and separating contact group on the isolation frame, and the contact in each contact group is separated through the baffle, avoids the fracture of contact piece to influence other area contact state, causes the opening contact to be connected for example, thereby avoids causing the risk of signal upgrading to occur.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, specifically to an electromagnetic relay contact isolation structure. Background Technology

[0002] A relay is an electrical control device that causes a predetermined step change in the controlled variable in the electrical output circuit when the change in the input quantity (excitation quantity) reaches a specified requirement. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is commonly used in automated control circuits, and is essentially an "automatic switch" that uses a small current to control a large current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] Forced-guided relays are a type of relay that are more reliable in industrial safety applications and are suitable for applications requiring high safety.

[0004] The internal contacts of a forced-guided relay generally include normally open and normally closed contacts, which are opened and closed by the moving and stationary contacts, respectively. Due to the forced-guided structure inside the relay, even if the contacts fuse, two pairs of contacts (normally closed NC / normally open NO) will not be simultaneously closed. According to the IEC 61810-3 standard, in the combination of NO and NC contacts, when the NO contact is fused, even if the power supply to the relay coil is disconnected (no excitation), the NC contact will not close, ensuring a certain contact gap. Furthermore, when the NC contact is fused, even if the power supply to the relay coil is turned on (excitation), the NO contact will not close, again ensuring a certain contact gap. Similar structural designs have been disclosed in the prior art, but they cannot prevent false contact closure caused by a single-point fault. For example, if a contact piece breaks, the free-state contact piece may close the open contact, posing a risk of signal escalation. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this utility model provides an electromagnetic relay contact isolation structure. By setting an arc-blocking plate on the isolation frame to separate the contact groups, and by using blocks to separate the contact areas within each contact group, it avoids the contact plate breakage from affecting the contact status of other areas, such as causing disconnected contacts to become connected, thereby avoiding the risk of signal escalation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an electromagnetic relay contact isolation structure, comprising a relay body, a base, an outer casing, and an isolation frame. The base has a plurality of contact pieces evenly distributed on it. A contact tail piece is disposed at the bottom of the base corresponding to the position of the contact pieces and electrically connected to them. A back plate is fixedly disposed on the rear side of the base. The isolation frame is detachably disposed on the base and the back plate. At least two arc-blocking plates are disposed on the isolation frame, dividing the plurality of contact pieces laterally into at least two contact groups. The arc-blocking plates can... The arc and broken contact pieces of adjacent contact groups are isolated. Each contact group has a blocking frame and an arc-blocking plate with blocks on both sides of the contact piece in the middle. A pair of blocks, together with the contact piece, divide the contact group longitudinally into at least two contact areas. The blocks can block the broken contact pieces in adjacent contact areas. The relay body is fixedly connected to the base and the back plate and electrically connected to the contact piece. The base, back plate and relay body are inserted into the outer cover from top to bottom, and the contact tail piece extends through the bottom of the outer cover. The top of the outer cover is fastened by a cover plate.

[0007] Preferably, a protrusion is provided at the center of the rear side wall of the isolation frame, a pair of buckles are provided at the bottom of the front side wall of the isolation frame, a through hole is provided on the back plate corresponding to the position of the protrusion, and a slot is provided on the base corresponding to the position of the pair of buckles, so that the protrusion can be inserted into the through hole and the buckles can be engaged in the slot.

[0008] Preferably, the front sidewall of the isolation frame has a pair of ventilation openings.

[0009] Preferably, an inner adhesive channel is formed at the bottom of the base near the contact tail piece, and an outer adhesive channel is formed at the bottom of the base near the edge. The inner and outer adhesive channels are filled with adhesive and then connected and sealed to the outer cover.

[0010] Preferably, the isolation frame, the arc-blocking plate, and the stop are made of dry unsaturated polyester molding compound.

[0011] This utility model provides an electromagnetic relay contact isolation structure, which has the following beneficial effects:

[0012] 1. This utility model separates the contact groups by setting an arc-blocking plate on the isolation frame and separating the contact areas in each contact group by a stop block, so as to avoid the contact plate breaking and affecting the contact status of other areas, such as causing disconnected contacts to connect, thereby avoiding the risk of signal escalation.

[0013] 2. In this utility model, the protrusion on the rear side wall of the isolation frame cooperates with the through hole of the back plate, and the buckle on the front side wall of the isolation frame cooperates with the slot of the base to achieve the purpose of detaching the isolation frame, which facilitates later maintenance and repair.

[0014] 3. In this utility model, a ventilation opening is provided at the center of the front side wall of the isolation frame. Before assembling the outer cover, the frame is cleaned by blowing air through the ventilation opening, and then the outer cover is installed to ensure the cleanliness of the inside of the relay.

[0015] 4. This utility model has an outer glue channel and an inner glue channel respectively provided at the bottom edge of the base and near the contact tail piece, which together with the outer cover form a cavity for glue filling and sealing, thereby improving the sealing performance of the relay. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the electromagnetic relay contact isolation structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the isolation frame after installation in this utility model;

[0018] Figure 3 This is a schematic diagram of the isolation frame in this utility model;

[0019] Figure 4 This is a schematic diagram of the base and back plate in this utility model;

[0020] Figure 5 This is a schematic diagram of the outer cover and the contact tail piece in this utility model;

[0021] Figure 6 This is a schematic diagram of the bottom of the base in this utility model;

[0022] Figure 7 This is a schematic diagram of the contact piece breaking in this utility model.

[0023] In the diagram: 1. Isolation frame; 2. Base; 3. Stop block; 4. Ventilation opening; 5. Arc damping plate; 6. Contact piece; 7. Contact group; 8. Contact area; 9. Back plate; 10. Outer cover; 11. Contact tail piece; 12. Relay body; 1-1. Protrusion; 1-2. Buckle; 2-1. Slot; 2-2. Inner glue channel; 2-3. Outer glue channel; 6-1. One set of normally open contacts; 6-2. One set of normally closed contacts; 6-3. Two sets of normally open contacts; 6-4. Two sets of normally closed contacts; 7-1. First group; 7-2. Second group; 7-3. Third group; 7-4. Fourth group; 81. One set of normally open area; 82. One set of normally closed area; 9-1. Through hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-7 As shown, an electromagnetic relay contact isolation structure includes a relay body 12, a base 2, an outer cover 10, and an isolation frame 1. A plurality of contact pieces 6 are evenly arranged on the base 2. A contact tail piece 11 is provided at the bottom of the base 2 corresponding to the position of the contact pieces 6 and is electrically connected to the contact pieces 6. A back plate 9 is fixedly provided on the rear side of the base 2. The isolation frame 1 is detachably mounted on the base 2 and the back plate 9. At least two arc-damping plates 5 are provided on the isolation frame 1, which laterally divide the plurality of contact pieces 6 into at least two... The contact group 7 and the arc-blocking plate 5 can block the electric arc and broken contact piece 6 of adjacent contact groups 7. Each contact group 7 has a blocking block 3 on both sides of the contact piece 6 in the middle, on the isolation frame 1 and the arc-blocking plate 5. A pair of blocking blocks 3, in conjunction with the contact piece 6, longitudinally divides the contact group 7 into at least two contact areas 8. The blocking blocks 3 can block the broken contact piece 6 of adjacent contact areas 8. The relay body 12 is fixedly connected to the base 2 and the back plate 9 and electrically connected to the contact piece 6. The base... 2. The back plate 9 and the relay body 12 are inserted into the outer cover 10 from top to bottom, with the contact tail piece 11 extending through the bottom of the outer cover 10. The top of the outer cover 10 is fastened by a cover plate. A protrusion 1-1 is provided at the center of the rear side wall of the isolation frame 1, and a pair of buckles 1-2 are provided at the bottom of the front side wall of the isolation frame 1. A through hole 9-1 is provided on the back plate 9 corresponding to the position of the protrusion 1-1, and a slot 2-1 is provided on the base 2 corresponding to the position of the pair of buckles 1-2. The protrusion 1-1 can be inserted into the through hole 9-1. -1 and simultaneously the buckle 1-2 can be snapped into the slot 2-1; the front side wall of the isolation frame 1 has a pair of ventilation holes 4; the bottom of the base 2 and the ring near the contact tail piece 11 has an inner glue channel 2-2, and the bottom of the base 2 and the ring near the edge has an outer glue channel 2-3, the inner glue channel 2-2 and the outer glue channel 2-3 are potted and sealed to the outer cover 10; the isolation frame 1, the arc plate 5 and the stop block 3 are made of dry unsaturated polyester molding compound.

[0026] Its detailed connection methods are well-known technologies in this field. The following mainly introduces the working principle and process, as follows:

[0027] According to the instruction manual Figure 1-7 As can be seen, in this utility model, the arc-blocking plate 5 on the isolation frame 1 horizontally divides the multiple contact pieces 6 into at least two contact groups 7. In each contact group 7, the isolation frame 1 and the arc-blocking plate 5, and the contact piece 6 in the middle, are respectively provided with a stop block 3 on both sides. The stop block 3 vertically divides the contact group 7 into at least two contact areas 8. One possible implementation is as follows: Figure 2As shown, there are 8 pairs of contact pieces 6 arranged in 2 rows and 4 columns. Three arc-blocking plates 5 are installed in each of the 4 columns of contact pieces 6, thus forming a contact group 7 in each column of contact pieces 6, resulting in four contact groups 7: a first group 7-1, a second group 7-2, a third group 7-3, and a fourth group 7-4. The arc-blocking plates 5 can block the arcs and broken contact pieces 6 in adjacent contact groups 7. For example, the arc-blocking plates 5 separate one normally open contact 6-1, one normally closed contact 6-2, and two normally open contacts 6-4. -3. Two sets of normally closed contacts 6-4 are isolated. Each contact group 7 is divided into two contact areas 8 by a pair of blocks 3 in conjunction with contact pieces 6, including a set of normally open areas 81 and a set of normally closed areas 82. The pair of blocks 3 can block the broken contact pieces 6 of adjacent contact areas 8. For example, the pair of blocks 3 can isolate a set of normally open contacts 6-1 from a set of normally closed contacts 6-2, or isolate two sets of normally open contacts 6-3 from two sets of normally closed contacts 6-4, etc. The third group 7-3 and the fourth group 7-4 are similar. This utility model separates the contact groups 7 by setting an arc-damping plate 5 on the isolation frame 1, and separates the contact areas 8 in each contact group 7 by the blocks 3, so as to prevent the broken contact pieces from affecting the contact status of other areas, such as causing the disconnected contact to become connected, thereby avoiding the risk of signal escalation. Figure 7 The effectiveness of the structural design of this utility model can be clearly observed. That is, when the contact piece 6 breaks, the design of the stop block 3 and the arc-blocking plate 5 makes the space between the moving contact, the stop block 3 and the base 2 in the relay body 12 very small. No matter how the broken stationary contact piece 6 rotates or moves, it will not move through this space. Therefore, it can be seen that the structure designed by this patent can ensure that when the contact piece 6 breaks, the free contact piece 6 will not cause the same group of switching contacts or adjacent contacts to be connected.

[0028] The relay body 12 is fixedly connected to the base 2 and the back plate 9 and electrically connected to the contact piece 6. The base 2, the back plate 9 and the relay body 12 are inserted into the outer cover 10 from top to bottom and the contact tail piece 11 extends through the bottom of the outer cover 10. The top of the outer cover 10 is fastened by a cover plate. This is the installation part of the relay, which is the existing technology and will not be described in detail.

[0029] The isolation frame 1 has a protrusion 1-1 at the center of its rear side wall, and a pair of clips 1-2 at the bottom of its front side wall. A through hole 9-1 is located on the back plate 9 corresponding to the protrusion 1-1, and a slot 2-1 is located on the base 2 corresponding to the clips 1-2. The protrusion 1-1 can be inserted into the through hole 9-1, and the clips 1-2 can be engaged in the slot 2-1. During installation, the protrusion 1-1 is first aligned with the through hole 9-1 and inserted, and then the clips 1-2 are inserted into the slot 2-1. The clips 1-2 are detachable from the slot 2-1, allowing the isolation frame 1 to be disassembled for easy maintenance and repair.

[0030] The front side wall of the isolation frame 1 has a pair of ventilation openings 4. Before assembly, the air is blown through the ventilation openings 4 for cleaning, and then the outer cover 10 is installed to ensure the cleanliness of the inside of the relay.

[0031] The base 2 has an inner glue channel 2-2 at the bottom and near the contact tail piece 11, and an outer glue channel 2-3 at the bottom and near the edge. The inner glue channel 2-2 and the outer glue channel 2-3 are glued and sealed to the outer cover 10 to improve the sealing performance of the relay.

[0032] Among them, the isolation frame 1, the arc-blocking plate 5 and the stop block 3 are made of dry unsaturated polyester molding compound, which has good insulation, heat resistance and structural stability.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic relay contact isolation structure, characterized in that, The relay includes a relay body (12), a base (2), an outer cover (10), and an isolation frame (1). Multiple contact pieces (6) are evenly arranged on the base (2). A contact tail piece (11) is provided at the bottom of the base (2) corresponding to the position of the contact piece (6) and is electrically connected to the contact piece (6). A back plate (9) is fixedly provided on the rear side of the base (2). The isolation frame (1) is detachably mounted on the base (2) and the back plate (9). At least two arc-blocking plates (5) are provided on the isolation frame (1) and transversely divide the multiple contact pieces (6) into at least two contact groups (7). The arc-blocking plates (5) can block the arc and broken contact pieces (6) of adjacent contact groups (7). Each contact... The isolation frame (1) and the arc-blocking plate (5) in the point group (7) are respectively provided with blocks (3) on both sides of the contact piece (6) in the middle. A pair of blocks (3) cooperate with the contact piece (6) to divide the contact group (7) longitudinally into at least two contact areas (8). The blocks (3) can block the broken contact piece (6) in the adjacent contact area (8). The relay body (12) is fixedly connected to the base (2) and the back plate (9) and electrically connected to the contact piece (6). The base (2), the back plate (9) and the relay body (12) are inserted into the outer cover (10) from top to bottom and the contact tail piece (11) passes through the bottom of the outer cover (10). The top of the outer cover (10) is fastened by the cover plate.

2. The electromagnetic relay contact isolation structure according to claim 1, characterized in that, The rear side wall of the isolation frame (1) has a protrusion (1-1) at its center, and the front side wall of the isolation frame (1) has a pair of buckles (1-2) at its bottom. The back plate (9) has a through hole (9-1) corresponding to the protrusion (1-1), and the base (2) has a slot (2-1) corresponding to the pair of buckles (1-2). The protrusion (1-1) can be inserted into the through hole (9-1), and the buckles (1-2) can be engaged in the slot (2-1).

3. The electromagnetic relay contact isolation structure according to claim 1, characterized in that, The front side wall of the isolation frame (1) is provided with a pair of ventilation openings (4).

4. The electromagnetic relay contact isolation structure according to claim 1, characterized in that, The base (2) has an inner glue channel (2-2) at the bottom and near the contact tail piece (11), and an outer glue channel (2-3) at the bottom and near the edge. The inner glue channel (2-2) and the outer glue channel (2-3) are glued and sealed to the outer cover (10).

5. The electromagnetic relay contact isolation structure according to claim 1, characterized in that, The isolation frame (1), the arc-blocking plate (5), and the stop block (3) are made of dry unsaturated polyester molding compound.

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